Rosie, have your doctors ever suggested Celiac? The symptoms include gut problems, fatigue, joint pain, etc. These are the symptoms of Celiac listed in the NIH site:
gas
recurring abdominal bloating and pain
chronic diarrhea
constipation
pale, foul-smelling, or fatty stool
weight loss/weight gain
fatigue
unexplained anemia (a low count of red blood cells causing fatigue)
bone or joint pain
osteoporosis, oste
openia
behavioral changes
tingling numbness in the legs (from nerve damage)
muscle cramps
seizures
missed menstrual periods (often because of excessive weight loss)
infertility, recurrent miscarriage
delayed growth
failure to thrive in infants
pale sores inside the mouth, called aphthous ulcers
tooth discoloration or loss of enamel
itchy skin rash called dermatitis herpetiformis
It goes on to say:
Recognizing celiac disease can be difficult because some of its symptoms are similar to those of other diseases. In fact, sometimes celiac disease is confused with irritable bowel syndrome, iron-deficiency anemia caused by menstrual blood loss, Crohn’s disease, diverticulitis, intestinal infections, and chronic fatigue syndrome. As a result, celiac disease is commonly underdiagnosed or misdiagnosed.
www.digestive.niddk.nih.gov/ddiseases/pubs/celiac/index.htm